Sorry, but I know very little about guns and their inner workings. Your best bet to identify the model exactly would be to contact taurus on the taurususa web site. I suggest their chat feature, as it seems to be the most responsive.
There are some real experts on here, so maybe if you post some pictures, you can get some help identifying the revolver.
Whatever you come up with, please post a follow up here so the next poor guy in the same boat will have a start.